Launch a target stdio MCP server and list its resources. Prefer a wrapper session if several stateful follow-up operations must hit the same target process.
AI agents call stdio_mcp_list_resources to retrieve information from MCP Stdio Wrapper without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs information retrieval (listing resources) without creating, modifying, deleting, executing code, or committing financial obligations. It is a discovery/inspection function typical of development tooling. The severity is low because listing resources has minimal blast radius — it reveals what is available but does not alter state or trigger external operations.
From the tool's definition Tool name contains 'list', and description states it 'list[s] its resources' — a query operation with no side effects. The action is to enumerate available resources from a target server.
Attacks that exploit this kind of access
Launch a target stdio MCP server and list its resources. Prefer a wrapper session if several stateful follow-up operations must hit the same target process. It is categorised as a Read tool in the MCP Stdio Wrapper MCP Server, which means it retrieves data without modifying state.
Register the MCP Stdio Wrapper MCP server in PolicyLayer and add a rule for stdio_mcp_list_resources: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP Stdio Wrapper. Nothing to install.
stdio_mcp_list_resources is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the stdio_mcp_list_resources rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for stdio_mcp_list_resources. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
stdio_mcp_list_resources is provided by the MCP Stdio Wrapper MCP server (joshuagreeff/mcp-stdio-wrapper). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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